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Biomedical subjects

S Almeida

Publications and source records attributed to S Almeida.

27 records · Page 2Linked to original sources

[Congenital cerebral arteriovenous fistula. Diagnostic peculiarity and surgical repair in an infant with heart failure].

A case of 3 month-old-boy with Down's syndrome and heart failure due to a localized arteriovenous fistula of the cranial vessels is reported. Clinical diagnosis was made after cranial bruit detection based on a retroauricular thrill incidentally felt by the mother. The diagnosis was confirmed by digital subtraction angiography and a good result was achieved by means of embolization and surgical ligation of the fistula. Three years after the operation the patient is asymptomatic, on no medication and with normal magnetic resonance image of the cranial vessels.

Angiography, Digital Subtraction↗

[Infantile hydrocephalus: long-term results in 102 patients and the importance of neurosonography].

A personal series (in 94% of the cases) of 102 children who underwent 170 procedures (1.66 procedures/patient) for hydrocephalus has been followed for 5 1/2 years (Jan-83 to June-88). Most of the children were under two years of age (80%) and in these cases brain sonography was the examination of choice for both diagnosis and follow-up (307 examinations, 4.4 per patient). Only occasionally was computed tomography necessary for better study in these cases. Our results suggest that there was no significant difference between our cases and those published in the literature concerning the number or procedures/patient (1.66)., infection rate (5.2%), mortality rate (6.8%) and intellectual performance. We recommend the use of brain sonography both in diagnosis and follow-up studies for hydrocephalic children since this examination is innocuous, inexpensive and easy to perform by neurosurgeons. Also it provides a good interaction between the examiner, the child and the parents, which is of utmost importance for the comprehension of the disease by the parents and early diagnosis of complications by the neurosurgeon.

Cerebrospinal Fluid Shunts↗

Facile synthesis of monoacetylated spermidines, illustrating selective deacetylation and application of a common precursor.

The synthesis of all three monoacetylated spermidines is reported. N4-Acetylspermidine was obtained in four steps from spermidine via the triacetylated intermediate by selective deacetylation after exhaustive t-butoxycarbonylation as well as directly from a previously described protected precursor. N1-Acetylspermidine and N8-acetylspermidine were both obtained in four simple protection/deprotection steps from a common, selectively protected compound, thus illustrating the versatility of the latter.

Dealkylation↗

Analysis of traditional strategies to combat world hunger and their results.

The traditional strategies proposed for development of the agricultural production of the underdeveloped countries are examined in this article. It is shown that the application of these strategies in the past has proven insufficient to eliminate world hunger. The limitations of these strategies are discussed and proposals are made for achieving the agricultural development in the underdeveloped world that will be necessary to eliminate hunger in the near future.

Agriculture↗

Assessment of the world food situation-present and future.

The widespread bad harvests of 1972 in various regions of the world, the consequent reduction in grain reserves, the rapid rise in food prices almost everywhere and its impact on inflation, all have served to draw renewed attention to the problem of hunger which affects millions of human beings in the world today. During the 1974 United Nations World Food Conference many important matters relating to this problem were debated: the creation of international grain reserves; problems concerning world trade of foodstuffs; the current difficulties with certain key agricultural production factors, such as fertilizers; the necessity for organizing a worldwide information system on the situation; and prospects of various harvests and threats of famine in underdeveloped countries. It is often the case that discussion of the hunger problem does not correspond to the gravity of the crisis; true causes of the present situation are not examined, and measures are not adopted that will once and for all--for the first time--abolish hunger. In view of the prospect that the real issues are often ignored, the Transnational Institute provides this analysis in an attempt to clarify what must be done to abolish hunger in the belief that this is within the reach of humanity when and if we are determined to end the irrationalities of the present economic system and the relations of domination which some individuals and countries seek to continue.

Agriculture↗

[Chronic myeloid leukemia].

The authors describe a clinical case of chronic myeloid leukemia with a typical presentation (massive splenomegaly and marked leucocytosis), but with a complex translocation--t (7; 9; 22) (q11; q34; q11). The evolution was rather atypical with a lymphoblastic crisis in association with osteolytic lesions and with parenchymal and soft tissue lymphoblastic tumours.

Humans↗